Table 4. Changes in cardiorespiratory fitness variables from pre to post-intervention for the experimental groups (mean ± SD).
Variables Variables Pre-intervention Post-intervention Interaction effect Hedges' g (95% CI)
VO2max
(ml·kg-1·min-1)
HIIT 27.8 ± 2.0 30.7 ± 2.0* p = 0.001 1.39 (0.41 to 2.37) Large ↑
POL 28.3 ± 1.7 32.7 ± 2.3* 2.08 (0.99 to 3.17) Very large ↑
THR 28.2 ± 1.8 30.9 ± 2.1* 1.32 (0.35 to 2.29) Large ↑
CON 28.1 ± 2.2 27.9 ± 1.8 0.05 (-0.83 to 0.92) Trivial ↑
VT1
(%VO2max)
HIIT 55.6 ± 3.5 57.5 ± 3.3* p = 0.001 0.53 (-0.36 to 1.43) Small ↑
POL 56.3 ± 3.2 60.5 ± 3.0* 1.30 (0.33 to 2.26) Large ↑
THR 55.9 ± 2.3 58.7 ± 2.3* 1.17 (0.22 to 2.11) Moderate ↑
CON 56.1 ± 3.1 56.2 ± 2.9 0.03 (-0.84 to 0.91) Trivial ↑
VT2
(%VO2max)
HIIT 66.7 ± 3.0 69.9 ± 2.9* p = 0.001 1.04 (0.10 to 1.97) Moderate ↑
POL 66.3 ± 3.2 71.1 ± 2.6* 1.58 (0.57 to 2.58) Large ↑
THR 66.8 ± 2.8 68.6 ± 3.1* 0.58 (-0.31 to 1.48) Small ↑
CON 67.1 ± 3.2 67.2 ± 2.9 0.03 (-0.85 to 0.91) Trivial ↑
Qmax
(L·min-1)
HIIT 17.5 ± 1.0 18.1 ± 1.1* p = 0.001 0.55 (-0.35 to 1.44) Small ↑
POL 17.4 ± 1.2 18.5 ± 1.0* 0.92 (-0.01 to 1.84) Moderate ↑
THR 17.2 ± 1.1 17.7 ± 1.1* 0.44 (-0.45 to 1.32) Small ↑
CON 17.1 ± 1.0 17.2 ± 1.0 0.10 (-0.78 to 0.97) Trivial ↑
SVmax
(mL·b-1)
HIIT 92.5 ± 2.6 94.9 ± 2.9* p = 0.001 0.83 (-0.08 to 1.75) Moderate ↑
POL 92.3 ± 3.7 97.8 ± 4.4* 1.30 (0.33 to 2.26) Large ↑
THR 92.7 ± 2.6 95.3 ± 3.1* 0.87 (-0.05 to 1.79) Moderate ↑
CON 92.1 ± 2.4 92.2 ± 2.7 0.04 (-0.87 to 0.91) Trivial ↑
*denotes significant differences compared to pre and CON.
† denotes significant differences compared to other training groups.